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Sustained and controlled release compound fertilizer and its preparation method

A technology of compound fertilizers and granular fertilizers, which is applied in the direction of fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of inability to control the release rates of various nutrients, the inability to achieve differentiation of nutrient release periods, and low fertilizer utilization. Achieve the effects of avoiding nutrient loss, improving consistency, and high fertilizer utilization rate

Active Publication Date: 2012-10-17
SICHUAN MEIFENG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this kind of compound fertilizer is to coat the granules as a whole, the whole granule fertilizer has only one slow-controlled release film. After the soil moisture enters the slow-control release film, all the nutrients are dissolved and released, which can only be relatively slow-controlled. Therefore, it is impossible to control the release rates of various nutrients in granular fertilizers separately, and it is also impossible to realize the differentiation of all nutrient release periods in granular fertilizers. Low, there is a phenomenon of waste and environmental pollution

Method used

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  • Sustained and controlled release compound fertilizer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The granules of the above-mentioned slow and controlled release compound fertilizer contain nitrogen, phosphorus, and potassium nutrients, and the specific preparation method includes the following sequential steps:

[0023] 1). Prepare nitrogen, phosphorus and potassium nutrients separately

[0024] ①. Crushing urea, the basic raw material for nitrogen nutrition, to 60-120 meshes;

[0025] ②. Add the crushed urea into the high-speed mixer and start the high-speed mixer; the temperature in the high-speed mixer is 66°C, and continuously and slowly add (to avoid agglomeration) 3% of the total weight of urea into the high-speed mixer. The colloidal material is in a liquid state, so that each microparticle urea and the colloidal material are fully stirred and mixed, and the stirring time is 5 minutes. The surface of each microparticle urea forms a colloidal film, and each microparticle urea is in the shape of a microcapsule;

[0026] ③. According to steps ① and ②, respecti...

Embodiment 2

[0031] The granules of the above-mentioned slow and controlled release compound fertilizer contain nitrogen, phosphorus, and potassium nutrients, and the specific preparation method includes the following sequential steps:

[0032] 1). Prepare nitrogen, phosphorus and potassium nutrients separately

[0033] ①. Crush ammonium chloride, the basic raw material for nitrogen nutrition, to 80-120 meshes;

[0034] ②. Add the crushed ammonium chloride into the high-speed mixer and start the high-speed mixer; the temperature in the high-speed mixer is 73°C, and continuously and slowly add 5% of the total weight of urea into the high-speed mixer (to avoid agglomeration). Material-resin, the colloidal material is in a molten state, so that each particulate ammonium chloride and the colloidal material are fully stirred and mixed, and the stirring time is 4min. The surface of each particulate ammonium chloride forms a gelatinous film, and each particulate ammonium chloride is micro Capsul...

Embodiment 3

[0039] The granules of the above-mentioned slow and controlled release compound fertilizer contain nitrogen, phosphorus, and potassium nutrients, and the specific preparation method includes the following sequential steps:

[0040] 1). Prepare nitrogen, phosphorus and potassium nutrients separately

[0041] ①. Crushing urea, the basic raw material for nitrogen nutrition, to 60-100 meshes;

[0042] ②. Add the crushed urea into the high-speed mixer and start the high-speed mixer; the temperature inside the high-speed mixer is 80°C, and continuously and slowly add 4% of the total weight of urea into the high-speed mixer (to avoid agglomeration). Lipids, colloids, and colloidal materials are in a liquid state, so that the microparticles of urea and the colloidal materials are fully stirred and mixed for 5 minutes. The surface of each microparticle of urea forms a colloidal film, and each microparticle of urea is in the shape of a microcapsule;

[0043] ③. Follow steps ① and ② to ...

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Abstract

The invention discloses a sustained and controlled release compound fertilizer and its preparation method. The compound fertilizer is a particulate fertilizer, the particulate fertilizer contains various nutrients, and surfaces of solid particles of each nutrient are coated with sustained and controlled release gummy films. The preparation method comprises the following steps: 1, respectively preparing the various nutrients: (1) crushing base raw materials of a single nutrient, (2) adding the crushed base raw materials to a high speed mixer, starting the high speed mixer, and adding the gummy material having a weight being 2-8% of the total weight of the base raw materials to the high speed mixer, fully stirring and mixing the base raw materials of the particles and the gummy material to form the gummy films on the surfaces of the base raw materials of the particles and make the nutrient have a microcapsule shape, and (3), respectively preparing other nutrients according to step (1) and step (2); and 2, preparing the sustained and controlled release compound fertilizer: sending the various microcapsule-shaped nutrients to a granulator, and granulating to mutually mix the various microcapsule-shaped nutrients and form the sustained and controlled release particulate fertilizer. According to the invention, the agreement of the nutrient release rate of the fertilizer and the plant nutrient absorption rate is improved, and the utilization rate is high.

Description

technical field [0001] The invention relates to a slow and controlled release compound fertilizer and a preparation method of the slow and controlled release compound fertilizer. Background technique [0002] The slow and controlled release compound fertilizer controls the release rate of nutrients in the fertilizer and prolongs the release period, so that the fertilizer can meet the nutritional needs of crops throughout the growth period. [0003] In the existing slow-controlled release compound fertilizer, various nutrients are mixed to form granules, and a layer of resin film is wrapped on the surface of the granules, and the slow-controlled release film is formed with the resin film. When the granular fertilizer is applied to the soil, the soil moisture enters from the pores of the slow and controlled release film, dissolves the wrapped nutrients, and these nutrients are released through the micropores of the slow and controlled release film to provide growth nutrients f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
Inventor 詹荣唐立永杨秀桥冷衍界刘海涛李元军
Owner SICHUAN MEIFENG CHEM IND
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